The way the cerebellum controls movement is similar to the Rosenblatt perceptron. However, the computation of cerebellar error signals sent via the inferior olive has not been identified. Error signals may result from the difference between a desired trajectory and an actual trajectory. However, such a mathematical subtraction between thousands of fibers conveyed by two neural sources (peripheral and central) is not realistic. The paper shows that the source of error signal may be much simpler, and no computation is needed. Error signals arise first from peripheral disturbances, and later from cerebral computational overload.
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